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High-thermal-oxidation-activity aluminum powder with surface nanostructure and preparation method thereof

A nanostructured, oxidatively active technology that can be used in metal processing equipment, transportation and packaging to solve problems such as hindering complete oxidation, high process energy consumption, and increased specific surface area of ​​aluminum particles.

Inactive Publication Date: 2020-10-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The aluminum oxide shell on the surface of the micron aluminum powder seriously affects its thermal oxidation process and hinders its complete oxidation; under the combustion conditions of the solid propellant, the micron aluminum powder will also appear combustion agglomeration, and its energy release level will drop significantly
The mechanical ball milling method can effectively cause many defects, dislocations and cracks inside the aluminum particles in the aluminum powder, so that the specific surface area of ​​the aluminum particles increases, and at the same time breaks the original dense aluminum oxide film on the surface, which can improve the oxidation and combustion activity of the aluminum powder , but it has an impact on the storage stability of aluminum powder, and the energy consumption of the process is very high

Method used

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  • High-thermal-oxidation-activity aluminum powder with surface nanostructure and preparation method thereof
  • High-thermal-oxidation-activity aluminum powder with surface nanostructure and preparation method thereof
  • High-thermal-oxidation-activity aluminum powder with surface nanostructure and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0020] Add 2.5g of spherical aluminum powder and 0.185g of ammonium fluoride to 50ml of purified water to prepare aluminum powder aqueous suspension and ammonium fluoride aqueous solution respectively. After the preparation is completed, add the ammonium fluoride aqueous solution to the aluminum powder suspension under magnetic stirring at a speed of 600r / min, and react for 5 minutes; quickly centrifuge and filter to collect the solid filtrate; wash the solid filtrate with ethanol; The solid filtrate was dried under vacuum conditions at 60° C. for 12 hours, and spherical aluminum powder with high thermal oxidation activity with surface nanostructures was finally obtained.

Embodiment 2

[0022] Add 2.5g of flake aluminum powder and 0.185g of ammonium fluoride to 50ml of purified water to prepare aluminum powder aqueous suspension and ammonium fluoride aqueous solution respectively. After the preparation is completed, add the ammonium fluoride aqueous solution to the aluminum powder suspension under magnetic stirring at a speed of 600r / min, and react for 5 minutes; quickly centrifuge and filter to collect the solid filtrate; wash the solid filtrate with ethanol; The solid filtrate was dried under vacuum conditions at 60° C. for 12 hours to finally obtain flake aluminum powder with surface nanostructure and high thermal oxidation activity.

Embodiment 3

[0024] Add 2.5g of spherical aluminum powder and 0.5g of ammonium fluoride to 50ml of purified water to prepare aluminum powder aqueous suspension and ammonium fluoride aqueous solution respectively. After the preparation is completed, add the ammonium fluoride aqueous solution to the aluminum powder suspension under magnetic stirring at a speed of 600r / min, and react for 3 minutes; quickly centrifuge and filter to collect the solid filtrate; wash the solid filtrate with ethanol; The solid filtrate was dried under vacuum conditions at 60° C. for 12 hours, and spherical aluminum powder with high thermal oxidation activity with surface nanostructures was finally obtained.

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Abstract

The invention discloses high-thermal-oxidation-activity aluminum powder with a surface nanostructure and a preparation method thereof, and belongs to the technical field of preparation of energetic materials. The high-thermal-oxidation-activity aluminum powder does not contain additives, an original spherical structure is kept, and nanoscale pits and holes are formed in the surface of the aluminumpowder. According to a wet chemical method, a micron aluminum powder aqueous suspension is mixed with a low-concentration acid aqueous solution, and stirring and mixing are carried out at room temperature, so that ions in an aluminum oxide shell layer on the surface of the micron aluminum powder react with ions in the low-concentration acid aqueous solution to cause nanoscale corrosion defects onthe aluminum oxide shell layer, and the micron aluminum powder particles with the surface nanostructure are obtained. The aluminum powder prepared by the method has the characteristics of simple preparation method, cheap and easily available used raw materials and high thermal oxidation activity.

Description

technical field [0001] The invention relates to a high thermal oxidation active aluminum powder with a surface nanostructure and a preparation method thereof, belonging to the technical field of preparation of energetic materials. Background technique [0002] Energetic materials, as a class of high energy density materials, are the energy source for the power and damage of weapons and equipment. The energy performance of energetic materials directly affects the effectiveness of weapons. In order to increase the energy of the energetic material system, high-energy metal fuels, such as aluminum powder, magnesium powder, boron powder, etc., are usually added to the energetic material system. Aluminum powder has abundant raw materials, low cost, high energy density and high heat of combustion, and is widely used in energetic material systems such as solid propellants and explosives. However, energetic systems with high aluminum content will encounter problems such as incomplet...

Claims

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Application Information

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IPC IPC(8): B22F1/00
CPCB22F1/07B22F1/065B22F1/068B22F1/145
Inventor 杨荣杰唐伟强李建民
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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